Light-scattering studies of the liquid-glass transition of Cao, 4Ko.e(NOs)&. 4 have been carried out from 305 to 23'C. Composite spectra covering over four decades in frequency were obtained by combining data obtained with a Sandercock tandem Fabry-Perot interferometer and Raman spectra. Two-step relaxation processes were observed in the supercooled liquid near the glass transition. The e relaxation exhibits a temperature-independent stretching for T~T, with T, 105'C, which is about 45 'C above the glass transition temperature. The P-relaxation frequency scale indicates critical slowing down when the temperature approaches T, from either above or below. Scaling analyses for both o and P relaxations provide good agreement with the predictions of mode-coupling theory.PACS number(s): 64.70.Pf, 78.35.+c, 46.30.Jv

Single-crystalline, hexagonal covellite (CuS) nanoplatelets were successfully synthesized through a facile, inexpensive, reproducible, and improved solvothermal process in toluene at 120 degrees C for 24 h with hexadecylamine as a capping agent and copper acetate and carbon disulfide as precursors. These nanoplatelets are about 26+/-1.5 nm in diameter and 8+/-1.2 nm thick, and have a tendency to self-assemble into pillarlike nanostructures with face-to-face stacks, raftlike nanostructures with side-by-side arrays, and stratiform nanostructures with layer-by-layer self-assembly. The crystal shape, morphology, and crystallographic orientation of the covellite obtained were investigated by means of XRD, TEM, and high-resolution TEM, and a potential self-assembly mechanism was proposed.

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CoNi2S4/graphene nanocomposite electrodes exhibit excellent pseudocapacitance behavior enhanced by synergistic effect, demonstrating the nanocomposite's promise as an electrode material for high-performance supercapacitors.

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